/*
 * Licensed to the Apache Software Foundation (ASF) under one or more
 * contributor license agreements.  See the NOTICE file distributed with
 * this work for additional information regarding copyright ownership.
 * The ASF licenses this file to You under the Apache License, Version 2.0
 * (the "License"); you may not use this file except in compliance with
 * the License.  You may obtain a copy of the License at
 *
 *      http://www.apache.org/licenses/LICENSE-2.0
 *
 * Unless required by applicable law or agreed to in writing, software
 * distributed under the License is distributed on an "AS IS" BASIS,
 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 * See the License for the specific language governing permissions and
 * limitations under the License.
 */

package org.apache.hop.pipeline.transforms.rowsfromresult;

import org.apache.hop.core.Result;
import org.apache.hop.core.RowMetaAndData;
import org.apache.hop.core.exception.HopException;
import org.apache.hop.i18n.BaseMessages;
import org.apache.hop.pipeline.Pipeline;
import org.apache.hop.pipeline.PipelineMeta;
import org.apache.hop.pipeline.transform.BaseTransform;
import org.apache.hop.pipeline.transform.ITransform;
import org.apache.hop.pipeline.transform.TransformMeta;

/**
 * Reads results from a previous pipeline in a Job
 *
 * @author Matt
 * @since 2-jun-2003
 */
public class RowsFromResult extends BaseTransform<RowsFromResultMeta, RowsFromResultData>
    implements ITransform<RowsFromResultMeta, RowsFromResultData> {
  private static final Class<?> PKG = RowsFromResult.class; // For Translator

  public RowsFromResult(
      TransformMeta transformMeta,
      RowsFromResultMeta meta,
      RowsFromResultData data,
      int copyNr,
      PipelineMeta pipelineMeta,
      Pipeline pipeline) {
    super(transformMeta, meta, data, copyNr, pipelineMeta, pipeline);
  }

  @Override
  public boolean processRow() throws HopException {
    Result previousResult = getPipeline().getPreviousResult();
    if (previousResult == null || getLinesRead() >= previousResult.getRows().size()) {
      setOutputDone();
      return false;
    }
    RowMetaAndData row = previousResult.getRows().get((int) getLinesRead());
    incrementLinesRead();

    // We don't get the meta-data from the previous transforms (there aren't any) but from the
    // previous pipeline or workflow
    //
    data.outputRowMeta = row.getRowMeta();

    // copy row to possible alternate rowset(s).
    //
    putRow(data.outputRowMeta, row.getData());

    if (checkFeedback(getLinesRead())) {
      if (log.isBasic()) {
        logBasic(BaseMessages.getString(PKG, "RowsFromResult.Log.LineNumber") + getLinesRead());
      }
    }

    return true;
  }
}
